Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d10a5976615e65…

MALICIOUS

PDF

69.2 KB Created: 2020-11-27 17:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 48d631ddb480574d7ad05f7264fdbd83 SHA-1: ec2bd12afd589502f57eae56a3474d26c82ad47f SHA-256: a2d10a5976615e65d45c07d2aa84b6fd53d48bd4ec772b6b26cb712ad3a66ae3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary external URL points to a domain associated with traffic redirection, likely to a malicious site. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/123?utm_term=portable+air+conditioner+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f91ca9d7a33c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_5f969f7b9c073.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/8543469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f9af621997c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f8feabe3513c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_5fa20e9e43e97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/71207e58-fcf9-4243-927c-422ddafd436d/samsung_steam_dryer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11bdaa71-a9f4-43c4-89c1-1d48b89eae98/lediwonarebomusujaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146c042e-3e33-4849-8005-3d8532c6b25e/36913475706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b072c721-0915-4087-aa30-75b6314ce928/zadakovekinizujuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e2dcab-1f6a-437e-ab70-90f3b83735e3/48965062642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5826d8e8-7f0f-4a1e-89c1-2e4e5dcb9434/bututajazulefu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 5148 bytes
SHA-256: e76f1e8f29750cfaf21bc5151fc6af4860588f4cba848bee80555f393d3bd5f2
font_01_sfnt_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 10420 bytes
SHA-256: 095e28657a6b0ea3daa8de11c56b8e585298247c595e26a8d2f49c3d6a61db07
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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